Four men can build four boats in four days.how long will it

Four men can build four boats in four days.how long will it how long will you stay there?()four days.填for还是in?表将来不是用in吗 He will be back in four days Four days! how long four times a Hours in four days -days in four weeks 对in four days提问 FOUR. four He will be back in four days .怎么问 It will take four seconds four o'clock to strike five how ma FOUR MEN IN A CAR怎么样